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How do I update?

Royal Summers asked in Rails
So, I'm following a YouTube  video trying to create my first Blog.  See the following link, at minute  13:50, https://www.youtube.com/watch?v=YCJqAZ--Sd8.  I'm attempting to do an update with appears to be a form helper.  Here's my line of code: <%= form_for(post, url: url, local: true) do |form| %>  Can anyone tell me why might the Update isn't working?
I just tried it again and got the following message:

Started POST "/authors/posts" for 127.0.0.1 at 2018-05-15 07:34:57 -0700
Processing by Authors::PostsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"07t0mQxSuviikB9QfFsDLpGAAq13aARnnE7CFNH8L8QgYDJOPX0oSzQl39u8NgkIhorDrexoYfn/93rq1iQJ1Q==", "post"=>{"title"=>"Royal Post 2", "banner_image_url"=>"", "body"=>"test", "description"=>"test"}, "commit"=>"Create Post"}
   (0.0ms)  begin transaction
  Post Exists (15.0ms)  SELECT  1 AS one FROM "posts" WHERE ("posts"."id" IS NOT NULL) AND "posts"."slug" = ? LIMIT ?  [["slug", "royal-post-2"], ["LIMIT", 1]]
   (0.0ms)  rollback transaction
  Rendering authors/posts/new.html.erb within layouts/author
  Rendered authors/posts/_form.html.erb (6.0ms)
  Rendered authors/posts/new.html.erb within layouts/author (104.0ms)
  Rendered layouts/_navbar.html.erb (2.0ms)
Completed 200 OK in 1337ms (Views: 771.7ms | ActiveRecord: 15.0ms)

Appears that the post already exists?  I recently added Devise and before got the message that I can't post unless the author exists but the author exists and I am signed-in?  Any suggestions?
Haven't looked at the YT vid, but based on your log, are you on correct page? `Rendering authors/posts/new.html.erb`
Check `rails routes` for the correct url, should look something like `edit_post`.
A typical Rails url would look like: `posts/<post_id>/edit`. 

The error about "Author doesn't exist" might have to do that you don't properly assign the Author to the post on create.
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